A 7 day JR Pass could work well for your itinerary if you can make the return Tokyo - Kyoto/Osaka within it's validity period. Right now it would work best if you activate it on the 28th of March and return from Osaka on the 3rd. This way you could cover the most of your travel with the JR Pass.

Sorry another question be, apparently I need to travel from TOKYO TO HAKONE on the 27 March, instead of the 28 March. So I need the JR PASS for this trip, do I need to book for 14 days for cheaper rate or 7 days only?